In my Nutrition practice, I work a lot with deconstructing (and reconstructing) the rules and habits we all form throughout our lives around food. From an early age we begin to put perceptions in place that inform how we interact with food. Whether subtle or overt, these ideas play a big role in our relationship with food.
Shifting a perception can take some work. Be willing to change the routine, try a new food or way of eating, challenge yourself to look deeply at your relationship with food.
You don’t have to actually flip upside down to change your perception (although it can be helpful!). Instead, understand what your food rules and beliefs are then flip them upside down. See how they look (and feel) from a different angle.